I moved my phone service 2 years ago from Vonage to Verizon. The number I have was originally a Verizon Number before I moved it to Vonage initially.
Did you call or are you trying it online? When I had the port done, I was told yes and the day the service was turned on, a tech came to the house to move the wiring over and then they ported the phone over immediately.
So, the folks that said yes and no, did you speak to someone from VZ or someone else?
Jim